var createError = require("http-errors");
var path = require("path");
var express = require("express");
var cookieParser = require("cookie-parser");
var logger = require("morgan");
const session = require("express-session");

var indexRouter = require("./routes/index_router");
var userRouter = require("./routes/user_router");
var blogRouter = require("./routes/blog_router");

var app = express();

// view engine setup
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "ejs");

// session配置
app.use(
    session({
        secret: "myblog",
        resave: false,
        saveUninitialized: true, // 指定登录会话的有效时长

        // 用户的主要信息存储在服务端的session中 
        // 但依然需要在客户端的cookie中放置一个【信物】
        // 用于从服务端海量的session中检索到属于您的那一个
        cookie: { maxAge: 1000 * 60 * 5 },
    })
);

app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, "public")));

app.use("/", indexRouter);
app.use("/user", userRouter);
app.use("/blog", blogRouter);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
    next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get("env") === "development" ? err : {};

    // render the error page
    res.status(err.status || 500);
    res.render("error");
});

module.exports = app;
